A pressure regulator is a device that controls the pressure of a fluid or gas within a system. It ensures that the pressure remains at a desired level, preventing fluctuations that could cause damage or inefficiency. Pressure regulators are commonly used in various applications, including gas pipelines, water supply systems, and industrial machinery. These devices work by automatically adjusting the flow of the fluid or gas based on the pressure detected. When the pressure exceeds a set limit, the regulator reduces the flow, and when it drops below the desired level, it allows more flow. This helps maintain consistent performance and safety in the system.